Asked by Annonymous

Let f(x) = x^2 - 2x. Find all real numbers x such that f(x) = f(f(x)).

Thanks.

9 years ago

Answered by bobpursley

f((x))=f(x)^2-2f(x)
= (x^2-2x)^2 -2x^2+4x
= expand those out, combine.

9 years ago

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